I have a G62-a50SM and after updating to that bios both graphic cards got disabled.

I sent it in for repairs and they replaced the motherboard and told me that HP is aware that that bios may disable the motherboard for that model, and told me to wait for a newer version of the bios and then update. (Why is that bios still available for download on their site for my model then?)

So, if you don't have a warranty, you should stay away from bios version F.35 A